…Or Your Money Back is a science fiction novella by Randal Garrett, first published in 1951, under the pen-name David Gordon.
There are lots of things that are considered perfectly acceptable … provided they don't work. And of course everyone knows they really don't, which is why they're acceptable….
Randall Garrett (1927–1987) was an American science fiction and fantasy author. He was a prolific contributor to Astounding and other science fiction magazines of the 1950s and 1960s. He instructed Robert Silverberg in the techniques of selling large quantities of action-adventure science fiction, and collaborated with him on two novels about Earth bringing civilization to an alien planet.
